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Thread: TLE9879 BDRV Drain source problem

  1. #1
    New Member New Member Sanyxx is on a distinguished road
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    TLE9879 BDRV Drain source problem

    Hi
    I use TLE9879-EvalKit for sensorless BLDC motor. Application work perfectly, but i have one problem.
    When motor in not running and all switches are off, i see short circuit on high side switches (see pic.1).
    When motor is running (motor work perfectly), i see short circuit on all switches (see pic.2).
    Disable drain source is not solve problem. What could be the problem? I think problem is BDRV settings, but i not find her.
    ?????? ?????? pic1.jpg‎   pic2.jpg‎  

  2. #2

    Infineon Employee
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    Lykaon is on a distinguished road
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    Hi Sanyxx,
    could you please increase the dead time and try again?
    Best regards
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  3. #3
    New Member New Member Sanyxx is on a distinguished road
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    Hi Lykaon
    I tried. Old dead time was 1.5 uS, new 3.5 uS. But it not decided my problem.
    In stop mode all mosfet are off. But status high side mosfets are "drain source detected".
    If i disable one of high-side driver - all ok. But if all three high-side drivers are enabled - all high mosfets are drain source detected.

  4. #4

    Infineon Employee
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    Lykaon is on a distinguished road
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    Ok, understood.
    What is your DS_Montitoring threshold?
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  5. #5
    New Member New Member Sanyxx is on a distinguished road
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    DS_Montitoring threshold is 0x3 (1V)
    I attached screenshots all BDRV registers.
    ?????? ?????? 1.jpg‎   2.jpg‎   3.jpg‎   4.jpg‎  

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